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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdee71239c3715dd6701b362811f56f471a6eeda8fb3b2d513ccd4c59051bb7f' 
  AND token = 'iagAh7CKIYGFIV9u0ObFiwCgJvT9AwOCLPI8bedDM70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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