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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d56bcc2d2809b4f5255695194957900fbb04d327c48e4399479a7c0ec9e5598' 
  AND token = 'ZTeqMIJIPTQ+AIOhzf4aqoSgu7+OPcfBm7xh2MfmQj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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