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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85e2b5ac8d5c2eccfa72ba6aaed5bf16e1f3200d7d03e7e75afdf8d57d238aa9' 
  AND token = 'hj+dGkpYEG+y6vg1+8FDNvkGV70JWn6rTfr5hy2X8WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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