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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf07fac139a9fe44d42a0a50f1551d9753c257a4cecd4eb9bedb0f64e1bcadf' 
  AND token = 'i/m1asFoOHCWkVVgJctKc1eivOa7rCH1er/dbmJPY70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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