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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef58db9a95a5d69a4fad5e9d60cccfbcf91a91a75b32c38217897fe7f9e333e' 
  AND token = 'uPFLIbN/OdvPCOzJ29LA/OYb+NaX4+nZ5SHhNA/43ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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