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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef97e4432deb3a0513aba2c38822fc87ee3db1a490e91d19a31f947dbcda5fd8' 
  AND token = '2WOsLo9XF7wZXLMIdlYC8YGTPpgkPpxxrjym+Nv0xPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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