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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd09bc5d998f4c8e1da7b1bf66e4bc5f3faf561f2ed3489f4ba7d66e5d66dea02' 
  AND token = 'KAGE1ue09iJxaQjkoLuXGOKw1MaaG9VWSikJubwKs+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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