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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '987f4e7f6196d718f93404f1fade65c0aa84e08648a918bbf1913ee7b427c069' 
  AND token = 'mWK4J7f1aERFLgyj0SPPJasJejS+J6snz9TEq+TdZRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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