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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72492e4a5e4d900329bb241791cc25e2e1be437f7df53466b59903c910dfbf76' 
  AND token = '2e5W519t9cNqWpmO01H4dBpdRX24p2ZFnf4F+DIdPEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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