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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '050751e680f2c43cbd0ac2db98a9e5110ce2db4a66635ce7c247c31af485ae93' 
  AND token = 'dbKjI2wINt6V4egAkrWgwWS5Du6rJwua3SbkM8aUYQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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