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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23795990c9ffa679252574eb19de91dd8715d49e556f0034ce29ec6cd1f3cd5c' 
  AND token = '6WA1gzc3/HoWmt5X4r5ns4nBrQp6Izr7McvlP9/Fr+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}