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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb217b8151f80603647b8b690b7452a95c1e783c4cad03b1f2dd0d0e072ef1f' 
  AND token = '9fWnfbNsa/T8183OXr3xVIpbYCPKBSpu/JG6jfrkopc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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