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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '720dd671237de7ae381371fc5e56ac6a444684cf0200e4b0c667d2807bd744b4' 
  AND token = 'QQkOrF5iUTCf1DDY69fPz3rUcEw9H1O6QqBo9oUqqNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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