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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '373828dfcde2ec49f2b20043c7893b6deb26b6e64590d9c5e32edb73df6e284d' 
  AND token = 'njvD4Z0x9JxlzGf6007M2XqDNHa2o87+eADCEjbrm0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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