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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c11d944d06a33886ceba323db0880f4a066f47e6e36b782834922ec4dc528d' 
  AND token = 'mNT5xO/u2+T+fmPdHXWyEb1CxLK0AbBInyx0u0DwQUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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