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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec0e83daf37254519a74c13112b2d96c1c40420e7d69a7e27f8dc28ac371a5a' 
  AND token = 'EqKqWLDFVaOOVhR/4jIB9L5hwrc3PQNjiTPrwot6IZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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