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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02bb3fa17f6b11efee5fb478a0b99ccc74def944f05986349f0cfdc491cce972' 
  AND token = 'UcJiUre5GxJLUeBqvYHk3Eu3jojTdX9tr+QXAUUn6oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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