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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfb98393de80c82f784f6ddd9c435bb575f2f2a1c322ca3001ad4505d26d6076' 
  AND token = 'a0zFd/3YCVs1OO07w1Jqm/dblDaBU1fRBf5hkiuKVec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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