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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51ff6febdf1c79f144a704f497afbad6d5645058bd975687d1c6b065a02ea49b' 
  AND token = 'ho9tgVkjjR5RXlwZincPQSgfbz7ok8yrBR3dj0O+XH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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