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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e19a81870c47f61fd718c562ccace8854d647311213b924fac22456358b1d102' 
  AND token = 'ntfNSXQa81muU25ug3Zji9XTnxNm72Q8n1QsbWOtLqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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