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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '552fd66ff7bb38c1324c2d976817abd5f331763e5e4f959c0c18f7d4eb77f2d8' 
  AND token = 'prwEGaYOB0hV3dBnpnRvo/oJHVasw1pH3u7RVRe5is4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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