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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb0de57bf66d2d15625aecda7a6e9be51a9247fb97f32754d9f0eac8cadb1f31' 
  AND token = 'DQTxpskOfo0daIJxQ/svZnxB/uPLTZLlMYcj4MKG2uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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