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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a438196b46d93f204bfa5737476f12785462c4e6b64eac4063317730f40bdf' 
  AND token = 'x5NMWd7hSCn2QAyvtmc4R4MIueJ+e2bWcgBSulu3SJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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