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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7dff45402a10dd6f0bc06d48de11c1fc29257357c83fed4fbab9899f0be9ff7' 
  AND token = 'Cp1dCynKiMFFGlDNL8WrKqbAR6i6wVmrEqCovkDj21Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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