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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '072d4807649152930cb5b2aab6f93d8e719e70222b414599a6764250488a05dc' 
  AND token = 'x5sbx0EGfSwemq3lz2e3asg9X7m5Ggh5HHnUECfj3JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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