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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9bd1cab5dfd3f3ee103a7ae2c472e7a8a09adbf124ae78ee57dd885cc4e2d68' 
  AND token = 'V4/+H7xIC35LgCuanyG2XpojRhOxj++vHHZhXd8idCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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