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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd3fb413df2bb92d50f02adae93c1a83ba63072bc96caa2ad6015941a2a5290' 
  AND token = 'mXDqGza0IKuNZOCQVcpRI+2jevrtk6d3yaOaRzgtQ0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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