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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43e13f8fb25bc1a49aa7e7a7848e17ddac37eea9ae367dedcf80d56baa747211' 
  AND token = 'vm3MmVA6ReFgNe51ECKI2blvJErlNw3zW40N1ZG3/5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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