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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e01c08b279fc60c4afad40815b271450c776b7c3d891d867fa2c02b9e764ee7c' 
  AND token = '/e/cR0zJ76mAWGo3oiMjSbMGK0yHzRPoX8bTTqDBWks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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