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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ae2a9b886d619b71a6b37df550d3e051a93caf6fac0053e61a418d8d928cc64' 
  AND token = 'YfqagKsNS0302A7SaadcdUC0g4CgRDix0RCkRKZpPXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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