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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0cf27dcd23f05df97f3441d3030a5af88310bbdda55bae4072b2e6317bab9d8' 
  AND token = '54ZmXHK1TqtVNDwaw1auoXHEm5O8ZXYuzP1LCf4NPSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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