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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e8c7c56fcca6c24ef76f7bcd863cc2a4527b60c377927e1195956cac616270' 
  AND token = '1UU9x6/ZcbQGsFcyqBn4Ju2byuJf+A987DBxp4pxUa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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