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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c81ab5cda37cbb8bc15f9369d21c8354e9cdda28dac9fbcfddc32eb7485b33b' 
  AND token = '190t6ovcUK2mPtGvmR295gVWfB0Tdc71z4aXU5qRIFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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