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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '739b74a87ee632d676a1802abb29619cdc1d080e1a52c88548ff2d4e8d560fa4' 
  AND token = 'xlMyclzblblj/X64cMlq0Jmoo+3fIhAxTE7AVM8NCk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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