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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b4b9525375059122a96255be77dae78979fed2356c108006a07606a769ae68d' 
  AND token = '9cJ7hWcXWqQ3+QPCgxgqBkyWfx9gNaZagbr8RWxP0/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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