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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba7b82f8540b64ddffbee835b558e63b1d0fb80b17988b7e5010f4e7ff042b1c' 
  AND token = '9uz6qBsMK1/PE6nhLBuaH6LyMgznjT1dPcZ/0/fJczk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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