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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ad72d892204538aae31b52c496fe0551d0b4446a290a8c387c079c1a7f1a072' 
  AND token = 'Q4lQa/nQRdMAkKibZGlhNf/pwb5vRTKs1D02citNPjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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