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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5be6e6f1498374806df634eaf1c11a2a377b8a208f92c52c8cdf2a3b8c5654c0' 
  AND token = 'OmgC32J2AssqA2Xj/cPWbrU+7qpm/7SD07YdXDTKssE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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