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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa15e7025b4675b792d5b9804c9c964191adccaa8e03ff34e57c789a8634d353' 
  AND token = '9MZac9/5i11SDP19p4H983ZE2daxM9lTzc5ZhXzv48A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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