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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71b88683b85b14dbecf86aa0ea11b7dd33dcbc0acf557331c83567f62f7b730' 
  AND token = 'ykBo/1rik7UFKugs8H0fthv1h8IhvVRL0sk7JHr1YAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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