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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3cd56515c109a153fb83caac76f79cc86c0cd86868a75b38a28e9b32a9c44ac' 
  AND token = 'PTnpANulGIFPEB8jD7MgFqI6pciYM/6pLp+Jg0lD2Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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