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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b51b9578bcd81f65757382518bc0905d6ac2ac1c9e89f66c8b0cb601135340e' 
  AND token = 'WnkTIL3cIyi6FTooOPB1LKD/15beqUVW7Gi2vVjpXkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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