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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '710797fe2323bd3bc1b8cf3fe84d5cdea8a44a7a663bd1d21fce55aa43ad88c5' 
  AND token = 'M8oFyXlMrG2//WFQDj46Rsi5hnObpoLf+fjeR6cMf6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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