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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93dfa67b7bc2a44b496d2542ebef9e27798836fa4f23a458a28d3ba6c9a0a9bc' 
  AND token = 'OnJeqXFJKT2/1cP2Y5a8qcshEn6zCxuMyfT7yGjTW/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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