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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb45357d38b6181c75b15361c45d4ff65349bafb23c63f8d2bfb3a250590f46' 
  AND token = 'Xo01KaDa7Bc2Skn5T4+EGKWDPL7BaCAHr4ETx/d1Mio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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