SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eab2c9d244f76d93451a9993bd756d69f3657b82caa2e1973d3aecd0c83e173' 
  AND token = 'Zm+/ly7uf72Cg8m7thPHlUI/EoKGaLBbptLTVVZUD0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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