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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '474bfd6785c3ae2f0df276a44447074889536221c0863497daa046ea4c9e9fd0' 
  AND token = 'r+d36Ro6A1LEAcREB2SYpc2rQSoANuMKA1nORorg63o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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