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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dad32cecb750223a76344344d2fa715e6ea565882b1c385ec49b762441b9ce40' 
  AND token = '1SEmDuo/4V7KuMcym35d6TddjhYJnHWFXp4GmFPawUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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