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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6391ed975ea359cc835da0212c40fa93ac7459aa04b784d011b645c01da12d2c' 
  AND token = 'k69wesxXoElXnGjppxCVss0AZ+pOqq4vSSifUNTzFgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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