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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bab87595ac707891941f960206406682e9de2d48f0bd6669da4eb6a20ba3da42' 
  AND token = 'TL7/7akJ9tGFyfGszr5eV1QxAb31Iy+srdv1pXxyxdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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